If x^a+x^b=x^c+x^d how do a,b,c,d relationship are? For instance: 3^(3x^2+8)+3^(4x+2)=3^0+3^(5x2+7) and (3x^2+8)(4x+2)≠0

Elena Marquez

Elena Marquez

Answered question

2022-10-06

If x a + x b = x c + x d how do a , b , c , d relationship are?
For instance:
3 ( 3 x 2 + 8 ) + 3 ( 4 x + 2 ) = 3 0 + 3 ( 5 x 2 + 7 )
and
( 3 x 2 + 8 ) ( 4 x + 2 ) 0

Answer & Explanation

cegukwt

cegukwt

Beginner2022-10-07Added 10 answers

Let a <= b and c <= d; then we write
x b ( x a b 1 ) = x d ( x c d 1 )
Also ( x , x a b 1 ) = 1 and ( x , x c d 1 ) = 1. x b | x b ( x a b 1 ) than we can say that x b | x d ( x c d 1 ) and x b | x d .The same way we can prove that x d | x b . Than we get that b = d. So we get
x b ( x a b 1 ) = x b ( x c d 1 )
x a b 1 = x c d 1
From this equation we can write a b = c d.Using that b = d we have that a = c.

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